Grinding-machine.



J. SCHMIDT.

moms MACHINE.

1,237,255. PatentedA11g.14,19l7.

4 SHEET$-SHEET I.

J. SCHMIDT.

GRINDING MACHINE.

APPLICATION FILED APR. 7, 1917.

Patented Aug. 14, 1917.

1,237,255. 4 SHEETSSHEET 2 3 12 11; 1. 15 -73 J! I 1 Z5 30 17 Z6 1 15 ,HI I j; T 3;.

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J. SCHMIDT.

GRINDING MACHINE.

APPLICATION FILED APR. 7, 1911.

I 1,237,255. Patented Aug. 14,1917.

I 4 SHEETS-SHEET 3.

J. SCHMIDT.

GRINDING MACHINE. APPLICATION FILED APR. 1, 1911.

Patented Aug. 14, 1917.

4 SHEETS-SHEET 4.

min

{I W W UNITED STATES PATENT OFFICE.

JOHN SCHMIDT, OF DAYTON, OHIO, ASSIGNOR TO JOHN SCHMIDT, CHARLES E. EMRICK, AND WM. 3'. SHERER, ALL OF DAYTON, OHIO.

GRINDING-MACHINE.

Specification of Letters Patent.

Patented Aug. 14, 191' Application-filed April 7, 1917. Serial No. 160,451.

To all whom it may concern:

Be it known that I, JOHN SCHMIDT, c1t1zen I of the United States, residing at Dayton, in

the county of Montgomery and State of Ohio, have invented certain new and useful Improvements in Grinding-Machines; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, whichform a part of this specification.

This invention relates to new and useful improvements in internal precision grinding machines. One object of the invention is to provide a device of this type which is especially adapted to refinish the inside surface of the cylinders of automobile engines without removing the engine from the frame of the automobile. Another object of the invention is to provide a device for this purpose which may be easily and accurately located on the cylinder block or casting. And a further object of the invention is to provide means whereby the grinding member is automatically reversed when it reaches one end of its travel in the cylinder. Preceding a description in detail reference is made to the accompanying drawing. Figure 1 thereofis a side elevation showing the front portion of an automobile with the hood broken away. My invention is there shown in a position in which it is operating upon the cylinder casting of an automobile engine. Fig. 2 is a side elevation of the invention partly in section. Fig. 3 is a section approximately on the line 3-3 of Fig. 2, the motor portion being shown in full. Fig. 4 is a section approximately on the line 4-4 of Fig. 2. Fig. 5 is a top plan view of the upper portion of the machine. Fig. 6 is a detail view of the upper bearing ring. Fig. 7 is a detail view of the reversing switch. Fig. 8 is a detail view of the worm drive, and Fig. 9 is a diagrammatic view of description and drawings similar reference characters indicate corresponding parts.

Referring more particularly to the drawings, 1 represents a cylinder block or casting which in this instance is provided with a cylindrical bore 2. The piston (not shown) of the automobile engine reciprocates within the bore, and as is well known, causes the walls of the bore to become worn when in extended use. This deterioration or wear results in a loss of compression in the cylinder which it is desirable to overcome. To accurately refinish the surface of the bores of cylinders by grinding, the following means are provided. The grinding or refinishing is accomplished by a grinding wheel 3 made of emery or carborundum.

The said grinding wheel 3 is attached to the shaft 4 is journaled in a vertically movable elongated cylinder casing 6 by means of lower and upper bearings 7 and 8, and said shaft 4 is rotated through a train of mechanism as follows. Mounted on the upper end of the shaft 4 is a miter gear 9 in mesh with a miter gear 10 which receives a splined shaft 11. The gear 10 and the shaft 11 are supported by a bearing 12 which receives the hub of the gear 10 and extends from the bearing 8. The shaft 11 is at tached to a miter gear 13 in mesh with a miter gear 14 splined to a shaft 15. In the present instance the shafts 11 and 15 are shown square but it will be understood that the splined connections between the said shafts and gears may be effected by any otherwell'known means. The gears 13 and 14 are maintained in mesh by an angular bracket bearing 16 which of the gears.

receives the hubs I When the casing 6 moves ver-' tically, it carries with it the gears 13 and 14 rately located by the following means.

provided with a miter gear 21 which meshes bearing ring 20. The shaft 23 is provided with a spur gear 25 (Figs. 3, and 8) which meshes with spur gear 26 attached to the shaft of an electric motor 27 which provides the power for driving the grinding wheel 3.

The casing 6 which receives the shaft 4 is supported and the grinding wheel is a icflle said casing 6 is provided with an upper split bearing 28 and a lower split nut bearing 29 (Fig. 3). The split bearings 28 and 29 are mounted upon guides 30 and reciprocate in openings 31 in upper and lower rotating members 32 and 33 respectively. The guides 30 are firmly attached to the rotating members 32 and 33 and said rotating members are .rigidly connected by posts 34 which connection compels them to rotate in unison. The split bearings 28 and 29 are secured in position by means of set screws 35 which pass through bosses 36 secured to the rotating members 32 and 33. The openings 31 in which the split bearings 28 and 29 reciprocate are radial to the center of the rotating members 32 and 33. Consequently, when the shaft 4 and casing 6 are located off the center of the rotating members 32 and 33, the grinding wheel 3 will travel in an eccentric path around the walls of the bore 2. In locating the machine above the cylindrical bore to be operated upon, the centers of the rotating members 32 and 33 are placed in axial alinement with the center of the cylindrical bore. Consequently, as the grinding wheel 3 travels in an eccentric path it will operate upon the surface of the bore. The position of the grinding wheel 3 may be adjusted for different diameters of bores and the depth of grinding by the set screws 35. Also different size grinding wheels may be provided for different size bores.

The rotating members 32 and 33 are supported by a main frame constructed as follows. The said rotating members 32 and 33 are provided with peripheral channels 37 which receive the upper and lower split bearing rings 18 and 20 respectively, before referred to. The rings 18 and 20 are split to permit them to receive the numbers 32- and 33. The said bearing rings 18 and 20 rest upon upper and lower horizontal bars 38 and 39, and are attached to said bars 38 and 39 by cap screws 40 which pass through slots 41 in the bearing rings and permit lateral adjustment of the shaft 4. The horizontal bars 38 and 39 are connected by vertical posts 42 which together with the bars 38 and 39 form a main supporting frame work which supports the grinding mechanjsm. The lower bars 39 of the main frame rest upon Z-bars 43 which rest directly upon the top of the cylinder casting 1, see Fig. 2. The bars 43 are held in position on the casting by cap screws 44 which pass through slots 45 in the bars, see Fig. 4. The slots 45 permit the Z-bars to be located on the cylinder casting. The main frame above referred to is attached to the Z-bars by bars 47 which engage the Z-bars through angular surfaces 48 which permit the main frame and the parts carried thereby to be moved along the Z-bars and to be adjusted longitudinally to the casting. The bars 47 are clamped to the bars 39 of the main frame by cap screws 49 which pass through slots 50 in the bars 39 and which permit of a lateral adjustment see Fig. 4.

At the time the grinding wheel 3 is being rotated-it is being moved vertically by the following means: The casing 6 is prevented.

from rotating by the bearings 12 and 16 and the shafts 11 and 15, Fig. 2. The casing 6 is also provided with exterior screw threads '51 which engage screw threads of the split bearing 29. As a consequence, when the split bearing 29 is rotated by the rotating member 33 which carries the same, the casing 6, and the shaft 4, and the grinding wheel 3 carried thereby will be slowly elevated or lowered depending upon the direction of rotation of the member 33. The members 33 and 32 and the parts carried thereby are rotated as follows. The said member 33 is provided with a worm gear 52 on its periphery which meshes with a worm 53 mounted upon the shaft 23, before referred to. It will therefore be seen that the grinding wheel 3 and the rotating member 33 are both driven from the electric motor 27. The motor 27 is automatically controlled as follows, see Fig. 4. I

The said motor is mounted upon lateral bars 54 which rest upon' the Z-bars 43 before referred to. The bars 54 are clamped to the Z-bars by bars 55 and cap screws 56 which enable the motor to be moved along the Z-bars in a manner similar to the bars 39 of the main frame. The bars 54 are further provided with upward extensions 57 which support a switch-board 58 upon which is mounted a service switch consisting of a switch arm 59 of insulation material pivoted at 60 and provided with conductors 61 at each end thereof. The conductors 61 are adapted to engage upper or connected to the negative leg 67 of the main line circuit, see Fig. 9. The left contact point 64 1s connected to the left-side of the field 68 while the right contact point is connected to the right side of the field 68 of the motor 27. The motor 27 is of the shuntwound type and the armature 69 thereof is connected into the main line circuit, as is shown in the diagram Fig. 9. It will be seen that by shifting the switch arm 59 the current will be reversed in the field 68 which will reverse the motor in a well known manner. The switch arm 59 is shifted through any well known type of snap switch mechanism by an arm 70 pivoted at 60 and actuated by a rod 71., The rod 71 is carried by the casing 6 and verti- 5 cally reciprocates therewith. The said rod 71 is connected to the casing 6 by a reach arm 72 which extends from the casing 6 at the bearing 8, see Figs. 5 and 8. The rod 71 is provided with suitable upper and lower tappet members 73 shown dotted in Fig. 3 and which are adapted to engage the arm 70. When the grinding wheel 3 reaches its lowermost position, the upper tappet 73 will engage the arm 70 which act will shift the switch arm 59 thereby reversing the motor and the vertical travel of said grinding wheel 3. The reverse operation takes place at the upper end of the cylinder if it is desired to continue the grinding opera tion.

In placing the machine in operation the Z-bars 43 are located and clamped in position on the cylinder block or casting 1 by the cap screws 44. The machine is then located on the Z-bars by placing the bars 39 in contact therewith. After the centers of the rotating members 32 and 33 have been placed in axial alinement with the center of the cylinder, the main frame and the bars thereof are clamped in position by tightening the cap screws 40 and 49. In properly locating the grinding wheel 3 in the cylinder bore, the upper adjusting screws 35 are disengaged from their upper bearings 28, and the adjustment is secured by the lower set screws When the grinding wheel 3 is properly set to secure the proper depth of cut, the upper screws 35 will then be properly adjusted. The motor 27 is then adjusted upon the Z-bars 43 with the gears 25 and 26 in proper mesh, and is clamped to the Z-bars by the cap screws 56. The tappet rod 71 is then placed in operative relation with the switch arm 70. At the beginning of the grinding operation the grinding wheel 3 will be at the upper position of its travel or opposite that position shown in the drawing. When the motor 27 is then started by the service switch 46 the grinding wheel 3 will be rotated through the gears 26 and 25, shaft 23, gears 22 and 21, shaft 15, gears 14 and 13, shaft 11, gears 10 and 9, and shaft 4 and will travel in an eccentric path through the agency-of the gears 52 and 53. At the same time the shaft 4 is rotated, the casing 6, which carries said shaft 4 and which is prevented from rotation by the shaft 15, will travel downwardly through the agency of the split bearing 29 and the rotating member 33, the rotating member 33 being driven through the worm 53 on the shaft 23 above referred to.

While I have described my invention with some minuteness I do not intend thereby to limit myself to unnecessary details but on the contrary.I desire to claim the said invention commensurate with its scope. I claim:

1. A frame adapted to be placed upon an engine cylinder casting, a rotating frame mounted in said frame, a. non-rotatable, vertically movable threaded tubular member shiftably and eccentrically mounted in said rotating frame, an adjustable nut mounted on said rotating frame and in engagement with the threads of said tubular member, grinding means mounted on said tubular member, and means for rotating said rotating frame and said grinding means. 2. A frame adapted to be placed upon an engine cylinder casting, a rotating frame mounted in said frame, a non-rotatable, vertically movable threaded tubular member shiftably and eccentrically mounted in said rotating frame and in engagement with said member, a shiftable bearing and a shiftable nut mounted in said rotatin frame and in engagement with said tu ular member, grinding means mounted on said tubular member, and means for rotating said grinding means and. said rotating frame.

3. A frame'adapted to be placed upon an engine cylinder casting, a rotating ffame mounted in said frame, a vertically movable,

eccentrically mounted threaded member carried in said rotating frame, grinding means carried by said member, a vertically splined shaft connected to said grindin means and adapted to prevent the rotatlon of said member, and means for rotating said splined shaft and said rotating frame.

4. A frame adapted to be placed upon an engine cylinder casting, a rotating frame mounted in said frame, a vertically movable non-rotatable and eccentrically mounted member carried on and having engagement with said rotating frame, a shaft carried by said member, grinding means carried by said shaft, a vertical shaft having a splined connection with said first-named shaft, and a driving shaft having gear connection with said splined shaft and said rotating frame.

5. A frame adapted to be placed upon an engine cylinder casting, a rotating frame mounted in said frame, a vertically movable, non-rotatable threaded member eccentrically mounted in said rotating frame, an adjustable bearing and an adjustable nut carried by said rotating frame and in engagement With said threaded member, a shaft carried by said threaded member, grinding means carried on said shaft, a horizontal splined shaft connected to said first-named shaft, a vertical shaft having a splined connection to said horizontal shaft, a driving shaft connected to said splined shaft, and a Worm gear connection between said driving shaft and It said rotating frame.

In testimony whereof I aflix my signature in presence of a Witness. v

JOHN SCHMIDT. Witness:

MATTHEW SIEBLER. 

